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Correct. Find yourself some 1x Fir and splice in to eliminate that trench. No T&G, you'd have to pull up half the floor and re assemble. Top nail with a finish nailer and fill. The floor is going to be very rustic anyway and you won't notice the filled nail holes. Use your oscillating saw to square off the existing board ends receiving the new boards and keep the butt joints well spaced. Distress the new boards to blend in. This is a very common project for us and I keep a large stack of 1x4 Fir stored in the shop just for projects exactly like yours. Now that you've got all that old flooring out and decided to refinish the underlying Fir your work has just begun. That's why I was trying to steer you into a new floor. Unless you've done it before people don't realize the steps you need to take to make it look like it was there from the beginning. I've done hundreds of restored floors so it's routine for my crew. You're taking the plunge so hats off but you're work has just begun! Just don't take short cuts and It'll pay off in the end off in the end.
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